Frank J. on thu 29 sep 05
Thank you all who responded to my earlier post.
Now for the next question:
Mays Blue ^10R
Feldspar 30
Flint 26
China Clay (calcined) 17
Dolomite 16
Whiting 11
Rutile 8
Supposed to be blue with kind of iridescent flecks.
Not really knowing what type of feldspar to use, I made one batch using
F-4 Feldspar and one batch using G-200, both acted about the same.
Kind of thin at the top edge of bowls and color is very light whitish
grey moving down the bowl becomes darker grey then as it starts to
thicken hints of brown with the blue finally showing up at the foot
where it is thickest. It also shows up slightly in the incised areas
of the bowl where it can puddle a little. Halfway between glossy and
matte finish.
Actually a nice glaze once you get over your expectations, but remember
I am the Pyro not the Potter, and she has her own ideas about what she
wants.
So where does all this grey come from and where has the blue gone?
Is China clay anything more than EPK?
The only China clay available was calcined-could this have had an effect
on the color?
Thanks in advance for your replies.
Frank
William & Susan Schran User on fri 30 sep 05
On 9/29/05 6:09 PM, "Frank J." wrote:
> So where does all this grey come from and where has the blue gone?
Rutile blues often must be applied on the heavier side to achieve the blue
color, but also have a tendency to run when thick.
--
William "Bill" Schran
Fredericksburg, Virginia
Bruce Girrell on fri 30 sep 05
On Sept 1, I made a post entitled "Fluxing rutile - a followup report (long,
but some pretty pictures)"
Look for that and you should have all the information that you need, except
that you may have to visit Ian Currie's site to get the actual formulations
for things like "Glaze 16". The G200 would be a much closer match than the
F4 for the Custer that I used. My starting point was very similar to yours
and I ended up with two good candidates plus two more new formulations that
I am itching to try. I did use EPK and it was _not_ calcined.
There are lots of photos showing my results. I used both porcelain and
ovenware, a nice toasty brown clay. It looks as though you are just to the
southeast (referring to the Currie tile in my photos) of where you need to
be.
You're close. Hang in there.
Bruce Girrell in sunny northern Michigan
typing with my left hand today due to surgery on my right shoulder
yesterday.
Won't be throwing anything new for a week or two.
Message -----
From: "Frank J."
To:
Sent: Thursday, September 29, 2005 6:09 PM
Subject: Reduction Colors II
> Thank you all who responded to my earlier post.
>
> Now for the next question:
>
> Mays Blue ^10R
>
> Feldspar 30
> Flint 26
> China Clay (calcined) 17
> Dolomite 16
> Whiting 11
> Rutile 8
>
> Supposed to be blue with kind of iridescent flecks.
>
> Not really knowing what type of feldspar to use, I made one batch using
> F-4 Feldspar and one batch using G-200, both acted about the same.
> Kind of thin at the top edge of bowls and color is very light whitish
> grey moving down the bowl becomes darker grey then as it starts to
> thicken hints of brown with the blue finally showing up at the foot
> where it is thickest. It also shows up slightly in the incised areas
> of the bowl where it can puddle a little. Halfway between glossy and
> matte finish.
>
> Actually a nice glaze once you get over your expectations, but remember
> I am the Pyro not the Potter, and she has her own ideas about what she
> wants.
>
> So where does all this grey come from and where has the blue gone?
>
> Is China clay anything more than EPK?
>
> The only China clay available was calcined-could this have had an effect
> on the color?
>
> Thanks in advance for your replies.
>
> Frank
>
>
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